If you'd like to visit a Catholic Church or know more about what's going on in your area, a good place to find out more on the web are the diocesan websites. All in, there are 145 Latin Catholic dioceses, 33 Latin Catholic archdioceses, 15 Eastern Catholic dioceses, 2 Eastern Catholic archdioceses & 1 apostolic exarchate for Syro-Malankara Catholic Church dioceses in the USA (you can use a 'diocesan locator' using your zip code here)! They're listed here by state:
ALABAMA
Diocese of Birmingham - Archdiocese of Mobile
ALASKA
Archdiocese of Anchorage - Diocese of Fairbanks - Diocese of Juneau
ARIZONA
Holy Protection of Mary Byzantine Catholic Eparchy of Phoenix - Diocese of Phoenix - Diocese of Tucson
ARKANSAS
Diocese of Little Rock
CALIFORNIA
Diocese of Fresno - Archdiocese of Los Angeles - Diocese of Monterey - Diocese of Oakland - Diocese of Orange - Diocese of Sacramento - Diocese of San Bernardino - Diocese of San Diego - Archdiocese of San Francisco - Diocese of San Jose - Diocese of Santa Rosa - St Peter the Apostle Catholic Diocese for Chaldeans & Assyrians USA - Diocese of Stockton
COLORADO
Diocese of Colorado Springs - Archdiocese of Denver - Diocese of Pueblo
CONNECTICUT
Diocese of Bridgeport - Archdiocese of Hartford - Diocese of Norwich - Ukrainian Catholic Eparchy of Stamford
DELAWARE
Diocese of Wilmington
DISTRICT of COLUMBIA
Archdiocese for the Military Services - Archdiocese of Washington
FLORIDA
Archdiocese of Miami - Diocese of Orlando - Diocese of Palm Beach - Diocese of Pensacola-Tallahassee - Diocese of St Augustine - Diocese of St Petersburg - Diocese of Venice
GEORGIA
Archdiocese of Atlanta - Diocese of Savannah
HAWAII
Diocese of Honolulu
IDAHO
Diocese of Boise
ILLINOIS
Diocese of Belleville - Archdiocese of Chicago - Diocese of Joliet - Diocese of Peoria - Diocese of Rockford - Diocese of Springfield in Illinois - St Nicholas of Chicago for Ukrainians - St Thomas Syro Malabar Diocese of Chicago
INDIANA
Diocese of Evansville - Diocese of Fort Wayne-South Bend - Diocese of Gary - Archdiocese of Indianapolis - Diocese of Lafayette in Indiana
IOWA
Diocese of Davenport - Diocese of Des Moines - Archdiocese of Dubuque - Diocese of Sioux City
KANSAS
Diocese of Dodge City - Archdiocese of Kansas City in Kansas - Diocese of Salina - Diocese of Wichita
KENTUCKY
Diocese of Covington - Diocese of Lexington - Archdiocese of Louisville - Diocese of Owensboro
LOUISIANA
Diocese of Alexandria - Diocese of Baton Rouge - Diocese of Houma-Thibodaux - Diocese of Lafayette in Louisiana - Diocese of Lake Charles - Archdiocese of New Orleans - Diocese of Shreveport
MAINE
Diocese of Portland in Maine
MARYLAND
Archdiocese of Baltimore
MASSACHUSETTS
Archdiocese of Boston - Eparchy of Newton - Diocese of Fall River - Diocese of Springfield in Massachusetts - Diocese of Worcester
MICHIGAN
Chaldean Eparchy of St Thomas the Apostle - Archdiocese of Detroit - Diocese of Gaylord - Diocese of Grand Rapids - Diocese of Kalamazoo - Diocese of Lansing - Diocese of Marquette - Diocese of Saginaw
MINNESOTA
Diocese of Crookston - Diocese of Duluth - Diocese of New Ulm - Diocese of St Cloud - Archdiocese of St Paul and Minneapolis - Diocese of Winona
MISSISSIPI
Diocese of Biloxi - Diocese of Jackson
MISSOURI
Diocese of Jefferson City - Diocese of Kansas City-St Joseph - Maronite Eparchy of Our Lady of Lebanon - Diocese of Springfield-Cape Girardeau - Archdiocese of St Louis
MONTANA
Diocese of Great Falls-Billings - Diocese of Helena
NEBRASKA
Diocese of Grand Island - Diocese of Lincoln - Archdiocese of Omaha
NEVADA
Diocese of Las Vegas - Diocese of Reno
NEW HAMPSHIRE
Diocese of Manchester
NEW JERSEY
Byzantine Catholic Eparchy of Passaic - Diocese of Camden - Eparchy of Our Lady of Deliverance Syriac Catholic Diocese in the US & Canada - Diocese of Metuchen - Archdiocese of Newark - Diocese of Paterson - Diocese of Trenton
NEW MEXICO
Diocese of Gallup - Diocese of Las Cruces - Archdiocese of Santa Fe
NEW YORK
Diocese of Albany - Diocese of Brooklyn - Diocese of Buffalo - Armenian Catholic Eparchy of Our Lady of Nareg in New York - Eparchy of St Maron of Brooklyn - Lithuanian Catholics outside Lithuania - Archdiocese of New York - Diocese of Ogdensburg - Diocese of Rochester - Diocese of Rockville Centre - Diocese of Syracuse - Syro-Malankara Catholic Exarchate in USA
OHIO
Archdiocese of Cincinnati - Diocese of Cleveland - Diocese of Columbus - Eparchy of Parma - Romanian Catholic Diocese Eparchy of St George in Canton - Diocese of Steubenville - Diocese of Toledo - Ukrainian Catholic Eparchy of St Josaphat- Parma - Diocese of Youngstown
OKLAHOMA
Archdiocese of Oklahoma City - Diocese of Tulsa
OREGON
Diocese of Baker - Archdiocese of Portland in Oregon
PENNSYLVANIA
Diocese of Allentown - Diocese of Altoona-Johnstown - Byzantine Catholic Archeparchy of Pittsburgh - Diocese of Erie - Diocese of Greensburg - Diocese of Harrisburg - Archdiocese of Philadelphia - Diocese of Pittsburgh - Diocese of Scranton - Ukrainian Catholic Archeparchy of Philadelphia
RHODE ISLAND
Diocese of Providence
SOUTH CAROLINA
Diocese of Charleston
SOUTH DAKOTA
Diocese of Rapid City - Diocese of Sioux Falls
TENNESSEE
Diocese of Knoxville - Diocese of Memphis - Diocese of Nashville
TEXAS
Diocese of Amarillo - Diocese of Austin - Diocese of Beaumont - Diocese of Brownsville - Diocese of Corpus Christi - Diocese of Dallas - Diocese of El Paso - Diocese of Fort Worth - Archdiocese of Galveston-Houston - Diocese of Laredo - Diocese of Lubbock - Diocese of San Angelo - Archdiocese of San Antonio - Diocese of Tyler - Diocese of Victoria
UTAH
Diocese of Salt Lake City
VERMONT
Diocese of Burlington
VIRGIN ISLANDS
Diocese of St Thomas
VIRGINIA
Diocese of Arlington - Diocese of Richmond
WASHINGTON
Archdiocese of Seattle - Diocese of Spokane - Diocese of Yakima
WEST VIRGINIA
Diocese of Wheeling-Charleston
WISCONSIN
Diocese of Green Bay - Diocese of La Crosse - Diocese of Madison - Archdiocese of Milwaukee - Diocese of Superior
WYOMING
Diocese of Cheyenne